Lathe grinding attachment



Oct. 7, 1941.

Y B. E. SHERRILL LATHE GRINDING ATTACHMENT .Filed Sept. 29, 1939 2 Sheets -Shee t l A ,BZwL 1 X S/zerrzlll P BY// f INVENTOR H15 ATTORNEY.

4 f 19 II A L Patented Oct. 7, 1941 untrea- STAZEE-S: PATENT OFF-15GB LATHEEGBI'NDING' AIr AcHME r.

Burl E." Sherrill, Perm-Ind. I Application-September 29, 1939,-SerialNol- 297,079

I v r rolaims.

This invention relates-to improvements in lathe attachments and-has as'its principal-"object the provision I oi-"a power-driven adjustable grinder" adapted-for attachment'tothetool-carriage of a lathe for accurate adjustment regardless of the swing of the lathe;

A-- further and'more particular object is the provision of anattachment of the-class described including a base member adapted for attachment to-thetool-carriage-ofalathe and-having a swivel member mounted between-postsor trunnions on the-base memberfor movement about a horizontal-a-xis usuallyextending-transversely of the directiorr of adjusting movement of the tool carrier or--carriage (and therefore in parallelism with the movement of -th'e main carriage We of the lathe); the swivel memberhaving an eccentric journal in which is carried a spindle for the grinder'andwhichextends in parallelism with the pivotal axisof the swivel member, the attachmentfurther including a-motor mounted on the swivel '--member and'drivingly connected with the spindle; together with means for clamping the swivel member in various positions-ofadjustment. v

Viwed-fromanother aspect, it is an object of thednvention to-providean attachment of the class -described= including a swivel member, a grinding spindle'; and a driving motor assembled as-a unit-withtheaXes of themotor shaftfswivel, and-spindle-ar-ranged in-parallelism to rock about the pivotal'axisof the-swivel-as a commoncenter.

A further'an d specificpbjectis'the provision ofa swivel structure for use in anattachment of' the class" described and "including parallel sleeve 7 portions in one of. which is vjournaled a grinder spindle and in the other of which is journaled a swivel attachment and means. for securing the swivel member. in positions. of adjustment-relative. to its swivel. axis, the swivel member further including a mounting plate and. motor means secured thereon for rocking movement -With the swivel member.

Other objects, advantages and novel aspectsof the; invention reside. in. certain details-of constructionas well as thecooperative relationship ofthe,- componentparts of'thei illustrativeembodiment described. hereinafter in View of the annexed drawings, .in which: 7

Fig. 1 is=a perspectiveof the. complete: attachment;

Fig. 2 is a vertica-l section alongline. 2-4: of.

Fig. 1;.

Fig. 3 a sectionthrougheboth the swivel: and.

spindle axes of the swivel member, taken? along line 3-3 of Fig. '2; while r Fig. his a vertical section through thfii-SWiYBl, axis looking in the direction of line;44 of Fi .2. While the grinding attachment of thepresent;- invention is especially intended,- for use;;With lathes, itwill be understood that it is susceptible of other usesand applications, andv the references hereinafter to the use of the attachment incon nectionwith certain parts of v the lathe are not: to be construed as. a. limitation upon the-inventtion; I

In. the preferred embodiment illustrated in; Fig-; 1, the novel grinding attachment includes a mountingor base member in the formof a plate;

Ill-having a-key-ing tongue. I! on its-underside; for engagement in the usual keyway l2 providedin the tool carriage l3 of. alathe-e The base-plate; is provided-with oppositely positioned'trunnions; or posts It which, in thepresent instanceare; secured to the baseplate by means SuCh. aSjthQ;3 screws I5.

Mounted between the postsM-is aswivelmem ber; generally indicated at W and comprising"; (Fig. 2 particularly) apa-irof tubular members;- or sleeves N and I8 joined by a webbing-.19; which is preferably integral with the metal of the sleeves.

As shown in Fig. 3, thesleeve i8 is provided. with reduced endportions %which-fit into open-. ings in the posts 14; with shoulder portions 2L: accurately aligning the sleeve forswivel: or; retative; movementin-the postsortrunnions; A; pair of end bushings or plates 2-2 is fitted against;- the opposite, ends ofthe main sleeve-portion-|8,- each bushing having a reduced portion 2-3xwhich fits snugly into the boreof the-sleeveportion.

Means for securing or locking the swivel structure in-positions of adjustment relative :to the mounting, includes a rod- 24- threaded at one enda 25 into one of the bushings 22 while the.oppo-: site threaded end portion 26 oftherod passes freely through the-corresponding bushing for engagement with a retaining nut 21 which, when. loose, permits pivotal movement of the: sleeve portion l8 and hence of the-entire SWlVEIrmEmbBI, the nut beingturned up to lock the-swivel memher in any ofthepositions of, adjustment 1111159,. trated, for example-, in Fig.2. 7 The grinding mechanism includes-the;- provi.=.-.-= sion (Fig.13) of a spindle 30 journaled inrrollen bearings 3| and 3la; seatediuponishoulders; in the bore of the sleeve-portion: Hiat? opposite.

endsthereofgbushings'33 being threadedltinto thee.

ndslbf the sleeve tozsecure'the, bearingsain-place;

displacement of the spindle being prevented preferably by a forced fit of bearing 3| on the spindle. Lubrication may be effected through a fitting 34 (Figs. 1 and 2), grease being forced and packed in the sleeve, and working into the bearings.

The grinder spindle is provided with a shoulder portion 35 against which is seated the grinding wheel or other tool member 36 retained by a nut 37. At the opposite end of the spindle is a pulley 38.

Power drive means includes an electric motor 40 (Figs. 1 and 2) carried on a mounting plate 4| secured by means such as the screws 42 threaded into each of the sleeve portions I1 and N3 of the swivel unit so as to extend in parallelism with a plane through both axes 24 and 30 in the sleeves. Means such as the belt 43 provides a driving connection between the motor and the pulley 38.

1 In the use of the device, the attachment is seated on the tool carriage I3 of the lathe in the customary manner and secured in position by means such as the bolt 44 (Fig. 2), whereupon the main carriage l3a is moved to transport the grinder attachment into approximate operative engagement with respect to the work stock, as illustrated in dotted lines in Fig. 1, whereupon the nut 21 is loosened and the entire grinder unit rocked about the rod 24 asa swivel axis in order to bring the grinding wheel 36 into more accurate engagement with the Work stock, it beingapparent that by manipulation of the tool carriage, the swivel member of the grinding attachment, or the stock itself, a variety of angles of contact and approach may be achieved, and the grinder unit may be held stationary with respect to the work stock once the proper setting is made, or the main carriage may be moved in the usual manner to transport the grinder attachment relative to the work stock.

Thus, it will be apparent that the novel attachment makes it possible to adjust the grinder for use in lathes of various sizes, that is to say (within the limits of the radial swing of the swivel member) lathes having different swings or radial clearances between the dead center or chuck and the rails or bed. In this connection, a feature of novelty in the attachment resides in the mounting of the swivel member to pivot about a horizontal axis extending in the general direction of movement of the lathe carriage, although it will be apparent that the advantages of the particular structure of the swivel unit and mounting may be adapted for use otherwise than in conjunction with a lathe.

The various advantages and objects of the invention may be accomplished by modifications of the particular embodiment specifically described herein, and it is intended that the appended claims shall include all equivalent arrangements fairly coming within their call.

Having thus described my invention, what I claim as new and desire to protect by Letters Patent is:

l. A grinding tool comprising, in combination, a mounting plate with opposite trunnion posts, a swivel member including parallel bores, the opposite ends of one of said bores arranged in said trunnion posts to mount said member for rocking movement between said posts, a grinder spindle journaled in the other bore, a motor platform mounted on said member, a motor on said platform with a drive shaft parallel with said spindie, means drivingly connecting said drive shaft and spindle, and means arranged coaxially with the first mentioned bore and coacting with the ends of said bore to secure the swivel member in positions of rocking adjustment.

2. A lathe grinder attachment comprising, in combination, a base member with opposite posts thereon, a swivel member journaled between said posts, a grinder spindle journaled in said swivel member for rotation about an axis parallel with the journal axis of the swivel member, a motor mounting plate attached to said swivel member so as to lie in a plane approximately parallel with a plane through said journal and spindle axes, a motor mounted on said plate with its driving axis extending in parallelism with the aforesaid axes and situated at one side of said journal axis away from the spindle, means providing a driving connection between said motor shaft and said spindle, and means coacting with the journaling of said swivel member for securing the latter in positions of adjustment.

3. A lathe grinder attachment comprising, in combination, a base member, oppositely positioned posts on said member, a swivel member provided with parallel bores therethrough, the marginal portions at opposite ends of one of said bores each being journaled respectively in one of said posts, bushing means engaged in said opposite ends of said bore, and means interconnecting said bushing means for clampingly bearing the same against said posts to hold said swivel member in positions of rocking adjustment, bearing means engaged in said other bore, and a grinder spindle supported for rotation in said bearing means about an axis parallel with the rocking axis of said swivel member, a motor platform in the form of a plate attached to said swivel member so as to lie in a plane approximately parallel with a plane through said rocking axis and spindle, a motor mounted on said platform with a drive shaft extending in parallelism with said spindle, means providing a driving connection between said drive shaft and spindle, and a grinding element rotated by said spindle.

4. In a grinding attachment, the combination with a base member of swivel mechanism comprising opposite posts on said base member and a pair of tubular elements arranged in parallel side by side relationship, one of said elements be- 7 ing rotatably mounted at its opposite ends on said posts, means for clamping said member against rotation in positions of adjustment, a spindle journaled in the remaining tubular element, said spindle being adapted to have grinding and analogous tool elements mounted thereon, a platform seated against said tubular elements, and a motor on said platform and drivingly connected with said spindle.

5. In a grinding attachment of the class described, a swivel structure including a base, opposite trunnion posts on said base, said posts having aligned bores, a first cylindrical tube having reduced portions formed at the opposite axial ends thereof and each seating in a bore in one of said posts, a second cylindrical tube secured in parallelism fiush against said first tube, a spindle journaled in said second tube, said second tube providing a grease chamber for said spindle, a motor platform secured to said tubes, a motor mounted on said platform, means drivingly connecting the motor and spindle, and means for holding said first-mentioned tube against rotation relative to said posts.

6. In a grinder attachment, a swivel mechanism comprising means providing opposite trunnion posts, a first cylindrical member extending between said posts and journaled at its opposite ends therein for rotational adjustment, means for securing said member in positions of adjustment and including clamping bushings at the opposite ends of said cylindrical member, and means extending coaxially of said cylindrical member and engaged in said bushings for releasably drawing the latter against the ends of the cylindrical member and posts in clamping action, a second cylindrical member fixed in parallelism with said first-mentioned cylindrical member, spindle means journaled in said firstmentioned cylindrical member, the latter providing an internal bore around said spindle constituting a grease chamber, and a driving motor and means mounting the same for movement with said cylindrical members, said driving motor being drivingly connected with said spindle.

'7. A device of the class described comprising, in combination, a swivel member having parallel bores therethrough, a mounting base, a pair of trunnion posts on said base, means including formations arranged at the opposite axial ends of one of said bores and disposed coaxially of the latter for rotatably seating said swivel member against rotative displacement relative to said posts, a spindle journaled in the second bore, the latter constituting a lubricant chamber, and means communicating into said last-mentioned bore for the introduction of lubricant therein, a driving motor and means mounting the same on said swivel member for movement therewith, said motor being drivingly connected with said spindle, said spindle being adapted to drive rotary tools.

BURL E. SHERRILL. 

